/**************************************************************************//**
* [url=home.php?mod=space&uid=288409]@file[/url] main.c
* [url=home.php?mod=space&uid=895143]@version[/url] V1.00
* $Revision: 2 $
* $Date: 15/10/12 8:13p $
* [url=home.php?mod=space&uid=247401]@brief[/url] Demonstrate how to communicate with an off-chip SPI slave device.
* This sample code needs to work with SPI_SlaveMode.
*
* @note
* Copyright (C) 2013 Nuvoton Technology Corp. All rights reserved.
*
******************************************************************************/
#include <stdio.h>
#include "Mini51Series.h"
#define TEST_COUNT 16
uint32_t g_au32SourceData[TEST_COUNT];
uint32_t g_au32DestinationData[TEST_COUNT];
volatile uint32_t g_u32TxDataCount;
volatile uint32_t g_u32RxDataCount;
volatile uint8_t g_u8Done;
void SYS_Init(void)
{
/* Unlock protected registers */
SYS_UnlockReg();
/*---------------------------------------------------------------------------------------------------------*/
/* Init System Clock */
/*---------------------------------------------------------------------------------------------------------*/
/* Set P5 multi-function pins for XTAL1 and XTAL2 */
SYS->P5_MFP &= ~(SYS_MFP_P50_Msk | SYS_MFP_P51_Msk);
SYS->P5_MFP |= (SYS_MFP_P50_XTAL1 | SYS_MFP_P51_XTAL2);
/* Enable external 12MHz XTAL, internal 22.1184MHz */
CLK_EnableXtalRC(CLK_PWRCON_HXT|CLK_PWRCON_HIRC_EN_Msk);
/* Waiting for clock ready */
CLK_WaitClockReady(CLK_CLKSTATUS_XTL_STB_Msk | CLK_CLKSTATUS_IRC22M_STB_Msk);
/* Switch HCLK clock source to XTL */
CLK_SetHCLK(CLK_CLKSEL0_HCLK_S_XTAL,CLK_CLKDIV_HCLK(1));
/* STCLK to XTL STCLK to XTL */
CLK_SetSysTickClockSrc(CLK_CLKSEL0_STCLK_S_XTAL);
/* Enable IP clock */
CLK_EnableModuleClock(UART_MODULE);
CLK_EnableModuleClock(SPI_MODULE);
/* Select IP clock source */
CLK_SetModuleClock(UART_MODULE,CLK_CLKSEL1_UART_S_XTAL,CLK_CLKDIV_UART(1));
/*---------------------------------------------------------------------------------------------------------*/
/* Init I/O Multi-function */
/*---------------------------------------------------------------------------------------------------------*/
/* Set P0 multi-function pins for UART RXD and TXD */
SYS->P0_MFP &= ~(SYS_MFP_P01_Msk | SYS_MFP_P00_Msk);
SYS->P0_MFP |= (SYS_MFP_P01_RXD | SYS_MFP_P00_TXD);
/* Setup SPI multi-function pin */
SYS->P0_MFP |= SYS_MFP_P04_SPISS | SYS_MFP_P05_MOSI | SYS_MFP_P06_MISO | SYS_MFP_P07_SPICLK;
/* Lock protected registers */
SYS_LockReg();
/* Update System Core Clock */
SystemCoreClockUpdate();
}
void UART_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init UART */
/*---------------------------------------------------------------------------------------------------------*/
/* Reset IP */
SYS_ResetModule(UART_RST);
/* Configure UART and set UART Baudrate */
UART_Open(UART, 115200);
}
void SPI_Init(void)
{
/*---------------------------------------------------------------------------------------------------------*/
/* Init SPI */
/*---------------------------------------------------------------------------------------------------------*/
/* Configure as a master, clock idle low, falling clock edge Tx, rising edge Rx and 32-bit transaction */
/* Set IP clock divider. SPI clock rate = 1MHz */
SPI_Open(SPI, SPI_MASTER, SPI_MODE_0, 32, 1000000);
/* Enable the automatic hardware slave select function. Select the SS pin and configure as low-active. */
SPI_EnableAutoSS(SPI, SPI_SS, SPI_SS_ACTIVE_LOW);
}
void SPI_IRQHandler(void)
{
SPI_CLR_UNIT_TRANS_INT_FLAG(SPI0);
g_u8Done = 1;
}
int main(void)
{
uint32_t u32DataCount, i;
/* Init System, IP clock and multi-function I/O */
SYS_Init();
/* Init UART for printf */
UART_Init();
/* Init SPI */
SPI_Init();
printf("\n\n");
printf("+----------------------------------------------------------------------+\n");
printf("| SPI Driver Sample Code |\n");
printf("+----------------------------------------------------------------------+\n");
printf("\n");
printf("Configure SPI as a master.\n");
printf("SPI clock rate: %d Hz\n", SPI_GetBusClock(SPI0));
for(u32DataCount=0; u32DataCount<TEST_COUNT; u32DataCount++) {
g_au32SourceData[u32DataCount] = 0x00550000 + u32DataCount;
g_au32DestinationData[u32DataCount] = 0;
}
printf("Before starting the data transfer, make sure the slave device is ready. Press any key to start the transfer.\n");
getchar();
printf("\n");
SPI_EnableInt(SPI0, SPI_IE_MASK);
NVIC_EnableIRQ(SPI_IRQn);
for(i=0; i<TEST_COUNT; i++) {
g_u8Done = 0;
SPI_WRITE_TX(SPI0, g_au32SourceData[i]);
SPI_TRIGGER(SPI0);
while(!g_u8Done);
g_au32DestinationData[i] = SPI_READ_RX(SPI0);
}
printf("Received data:\n");
for(u32DataCount=0; u32DataCount<TEST_COUNT; u32DataCount++) {
printf("%d:\t0x%08X\n", u32DataCount, g_au32DestinationData[u32DataCount]);
}
printf("The data transfer was done.\n");
while(1);
}
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